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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bf485a9c216faf2666b0863f9c73d70bc4ac94a978b020b890914eefd740d71' 
  AND token = 'MPTY4OWdsRaG0v76lSW8PxQ99wfwds2fN40Am62XkZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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