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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12fa97d6d7fc3e7156e4f13aa469287d7e8a2016c07323e718380d6a1e58ffc2' 
  AND token = '093KUIFUTaQmi0sSriA8iaqd+9fXSdWsUmUgzyf/ZKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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