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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d8037e341ad2187f80497c33b28b1d4b4f4c3fddc47daa53a3dbcc4b2818a27' 
  AND token = 'F/jSNMYg1MXnehSFxE4XSGiJpwsIoiMtRBXJ8qyWAAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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