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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60e9a29e00a170e85bb70cd63f3b6800b2730dd7fb6eb27e0408214893fea1a3' 
  AND token = 'dobXng+6LtpWTWBygUGkowCNHnPRV13Alwih6S8OzSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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