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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a5b2f1ecb68a6944b2930800ef35d3f75ffc82d432925c28425190782b65776' 
  AND token = '2vBy66P6pb8kzG0T8yxsbZtrNUSfgWkP9XqNFqbk9x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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