SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c2481002948581ccce668a56418bc266b14bfd5f39885db64eb5e3f6fdf5984' 
  AND token = 'JBGoNBVQ4/5RhsV6Y0lPdnJ0jKM6NqzEGVnHArxCHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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