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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33eed7b57c9f5ea6dca0323dafeb2bceca7ad1661a3947198a394790a440cce5' 
  AND token = 'gEJgAeaCftubzb0u8GcQGf1dtoVpZg12lpkEQB9XaB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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