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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '586b95119174f5fb2abdeefdd928eab5b9deda017964d0ac9d1d98d4ba75686a' 
  AND token = '2LjwozJhGayOWf2G17T4slquElFWoFVuVdbNWMHy6Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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