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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d5a96377d63a098908ed86440ae684e33783b36dd00c83eac0f061d44728d3d' 
  AND token = 'fxYhPI2AJIQviyw6d28eO6KI3Z6sEYKxMlDUpbKDbSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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