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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86abde66783848314b763edcd21f2aa23929b50083e33b38689a69aeec531a77' 
  AND token = 'lEiyCILjo5iF/s9t7qSnglMtXsHpUt1veSo1IcUGSyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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