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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '476b75e2f40ead1260ef7db6a7a73662f83a43dc69cb607e4a260a27f6d0991c' 
  AND token = 'nIpt9TtEicjhnhfIOJ85Msw3/DsyVsQl5en/E/2Ut3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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