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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dd2f04899f89115dce115eaf0afe8fb54754e00b6a64f367d15a48f78135c13' 
  AND token = 'KAPjS27j8P9k4yF1VX14IF2uOUwhjGwstDcnRb7XU3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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