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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76412b206cdcb86bd8e783c8b3e46095f2b386bedab76ef33b2c8193b44fed5b' 
  AND token = 'CiZGGiiRbob28puuYNXn6ELq5q2T3RSU80K3MluxbwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}