SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2fac1897125e37144b8c5d0a1ee240b9c567f15533b3dc1153ff60f4ec1f745' 
  AND token = 'Unq6TGryUvemT0x6Fl2ROPLzh3xu/5ZfDwYA3+7Q/Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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