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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f9b7505ada6c413febe8ab903d0873b0b10c5dc10d73ce951d861532ecc3fb3' 
  AND token = 'tWJhi8TGJ750vrKggigTViZTjHbbk/1hSS40rE7Opbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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