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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4070ed4fa3e2d1de444441ad72f1b75f978b77e2266566d6e446f202c8ae5fd' 
  AND token = '2eDL6IcUhpC65tLaXEDL2obPlC+6dS25BnvUZP1dqfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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