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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfba44e5e0b70cfd425c184632bea3453c8c99e79ff7d1f423d7a6ae203463ae' 
  AND token = '14flA1dTWCEiHMXVeEDbdhu5ckXqVDu4sMnXV2WFQbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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