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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94fcf2db4e06bc7298d13c8883090059a91af35de02504b9b9889e2b3b59eedb' 
  AND token = 'm4aUCHeZ+Ox7lCWwCk4xbgSapv4Z5QOrUkz0RMzWVac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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