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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f0a28a929c6c29774736ff75fdccf50a688f1b4c46f34c10fdc5522f334dac3' 
  AND token = 'bHqUouS6kY2RdX3HxmOSAVDWE7lpw3H/nomSzj5/6do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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