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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb591100e1307ce4d374710886a084521215939ecb751f4402b02e169c6399bf' 
  AND token = 'AxPeSnl6KVzSNOB1eXeapwJXiBETsafhhv/TJNwJsU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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