SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13d38387526630c099ac517e686ab84d80adfb305638de65eee2d6b243e2a064' 
  AND token = '2gOJ7WNdKGV6LCci/FDT7mxhKoucws9BjORCmGEiK7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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