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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '794bf15ab4cb7bab1b1a865bbd75eca600bd91168dd2605d1a9092947f954011' 
  AND token = '4kZIBXd7ZmKpoMwD5Oov/FXw/XkOERgrb5l9s8Whxd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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