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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '372b259057664958d4f35bcc4b090c11235239142b33be481ed413b033683e97' 
  AND token = 'C6OVzWBOvPrRHsqvlxXEo9cdhR42b5EPdPKWP8q7IsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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