SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '360f290ac5c0f5b002549670982b78e17fcb8fef6a2dce9e6e5afd60b15db8d6' 
  AND token = 'srXIB5ZQP5zPpmkSfZkO+Lgd4qgXuTuFK8i+UV8bAOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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