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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '954389ae48a989f0d01d6218a8dbfe6217c370a354f30c9c32d691c33833c142' 
  AND token = '6meT4NqsH0srW6lbbEuu3ld1rSAb5yAK2KO32TlDXOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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