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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1564891f34a3e654558f2f9f846f80f2abb64d63ba59b6e12d88fa5cb83daec8' 
  AND token = 'NCskGoWEot1cgF89T1FyV21ha60DgMIcMcR89cW9LR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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