SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69dadfca98e429dbf0a56f8b9ed18cc5350c588862086dc1f4784807f520a6bb' 
  AND token = 'FaeNb+eIquKsV2YS9ZBO6KRJZFfe//8iDqUnPR+mpbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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