SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e320ce899a5d027b5595671e57eafdf7b893e289da5d4b328889d67bb45c88a0' 
  AND token = '6IC9BFB1ugloBgyVSqqj2WU4MypWKLmWUALR1qOuzf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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