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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed1dbdd0bf478f6a98d94d0f8adf025b12888f8420d480c988db0746d9785b1c' 
  AND token = '5xTiv7i5dmAguAVE0LzzBJMDasEtqHyUOEWLD9XvFLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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