SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcd57926533e818f0034c815b4d82f7bd4303e9ea0b8d2d99e734fafd4ca7f40' 
  AND token = '9sV7Hl6OuU/RLj5j/e1mvWLKgS3qkvgpRXZrAO+R+UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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