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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cacb78276162670535bc3c8e6b5469a9c925521099f62e1d635eb91b6eaeb42' 
  AND token = 'F1yxKaT5Z8Mm5uv2tiInKFEMe4jyiZSV9+R1710RlZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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