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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83e172da3dca1f2442c2bc63c82bf0fc36e3d8f12f9dedc148a57607bea69bea' 
  AND token = 't3pNV9w38mn+hJ+10l4WZP8wkvhpRJ9rwnwXEBlFcUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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