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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c22f36b303452e6b705ad85399c3d1520b594a01631cef0f4ef7c1a2d7ed630' 
  AND token = '9DtiS6vFWc55x7E/9SRwBzrX1zaCSfpQwxde8ce6ocI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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