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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00f850709734e7784434e04db37375b91912da93ade700ed1aff9c447b6dd318' 
  AND token = '/C7ihdXZlCdKS35SWYhD7hKU+pNebS7VDpOhPtkiud0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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