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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83555825de891ad9b6e7e2b13fdbebddec8100088c24a7bf7d6aafed9e3bc0e8' 
  AND token = '97cCIpMB1mZxTD1MGuQzMKwrl8rfG3wTSKdtItCLgzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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