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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b032036f99fbdb53c7f7636de89c48554c31065167e6b7b01c26dec7ba7341d' 
  AND token = 'DyoyPykpz5XWTUCKU6DrX0Q1+Za+pywFewYyPPi9kXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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