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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b9e4b5f4d5b8ab244441bb27a71cabe1098bacde610db35a09c8d10f9da3314' 
  AND token = 'QVtVar5311AmSNjOsq1sq569O3JS9DAhjU6IV1SC21Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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