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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2058a3c6e3e94f2a02b1c8990469243bbf07f34f24ed37b3c6efc8f258b03ae' 
  AND token = 'vnVyTjyplBO5y7JmDcYfoeG3SGkSIJhYtcsyQJUAJLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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