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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '113d9b3fbfd385ca0abfeebab8b12ec687a234e64ecad19d2311e82cbc5825b7' 
  AND token = 'gZUG18HAetUmPMKC2bRea1DHcsteRVbT9fODjlVll0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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