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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3818bd62391332ebc2bbe7c9477b2f461c1d5e98dffd968d2e1a37203d920611' 
  AND token = '9xeCbxmizJHNSkSmoa2hQiaqVO4LdazgAirKn0EmD/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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