SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '699f672b87c92742d681d05cc7d26b4cf1385a3ff95a9ab81876422cf9a38df7' 
  AND token = 'qYXYtmR/3HXVvmrM1Xx27E+cGAGbD3JgTGrWZp+V6aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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