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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0d61c5efaa9c9013eb9db8a53c032b86cc86987ef4b64e98d3f10c77ac02f1d' 
  AND token = 'IQXDiiWRgTRy1CUXsaajFZYIP81r/a76DP56xy1VbX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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