SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1589657db471fc86fdf590aae928b99ae3f5bbc126810e532c1e82e58ddbab83' 
  AND token = 'Vf6dmvQXaTf0ssqMNGKB+NgL3wzyIZYbFDh/KiFLGHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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