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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28ce446388aa22e1372b4efc8105c32107bdf6ed0044ed86134295e42a6990db' 
  AND token = 'DzEHUwLGojsKirENK7Edo8nAyMW8rQPU3hE1pp21lEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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