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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b3a7da71dc55b3deadaa32214a100f1eb58e7bad3ce3217ae011b947c0b8ccf' 
  AND token = 'KTRgsTXUDWYD1zTnGZPbc7YN+h+Gk3AwBMAlCvAwVYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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