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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9eef9498722e044b35b059b0b790f1b4f7bd9bbc0a2cb740aee2c45c79a6c66' 
  AND token = 'zvZb4cA1IJTM2XSUExY5WMozyenzfKZ0yxbLqGSwSZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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