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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fd5f658d6a642e011592152f3c386bf489d1b209dccfa0a20f7b4f295a6042b' 
  AND token = 'DKOvJ7VdB7EDGAXtemCgH30nGfEdBRyLL9VaTkpfz2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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