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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e13107e9b478197cb7a97fc145c8820572ba13b6d5c6d118cdf7441e254b5f1' 
  AND token = 'j3p5sYmr9KSf0kQlAQFiPj9r+9ut51zM6ChGToqeY4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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