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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aeb853f0cca402d8b0cc2be536a4c1707cdae72576cafaccff54870c142ad7cb' 
  AND token = '4C/4goctylJiCZ9jjng4glK5tP71ci4k/5CU9xiw4X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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