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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '730c6c8ba0e323928e95e0e9653ad902c1f9bd45562a018c3e85b159be820787' 
  AND token = 'Us0WUD60SDhe4qReKn87lRrlM54EzBDddsDHTcM6EzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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