SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f33f0570951c61ce4e662abda917b51052d9178534754f7c0573bfbb34555814' 
  AND token = 'sgj5EWF5ubyj+PtXhK/T/uwthUBiRrAnpuuF1LuCfZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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