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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feae3dff6de7e9ab74ccd36f1f8e1ac21f147ae1aec65a07128497b20b7ce36e' 
  AND token = 'FraXAOigDGpQx9CrDIECLTj7VgwweJIXhQOXD2wAt9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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