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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1d671bdee5ace0d272c2763381a3d6d09daf24467a7d118f23c30f4b47e5fd4' 
  AND token = 'fWuamozfyJqpg7P5URtF8aiUMdGL8LqDid9oGOOuvI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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