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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0811813a8f5adff64ea5a81678a0b6cfa4dff816260c5835372b51d4caff6a74' 
  AND token = '9NixeSwxQDDAD4AZEOK7dEeJbSVlTAuQ6rRCeAfZp/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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