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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70ca3cd4b1581abf8ddeaadb6654fbdd1e774ffd44841c98bf9ff76b69fd66e9' 
  AND token = 'JFj1CA66E8X43gxHuMSe4B5jq0SdQ9M/KmMirwgUvFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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