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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dca96d0becd50eafde3c45e92b514488be3682c6d45f086e4a9ce0a07b8a172f' 
  AND token = 'vj6tj3VL7m78e2ffxf1OIthlE/L6iLFfvNqET9N8jjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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