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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ef2b6f3a6ea57aa6e797434af74255614f4b9bc97caa821f392843b072cd63e' 
  AND token = '1SL6TldtqawON6ZiIRRHZeLZBbjIAgaPW8KvommgiS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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