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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9690de3c85823e820fb5cd35c1182a67eb7a086f212deab62fd2a031fb73af86' 
  AND token = '0Ls2one4iVb/Y8Mf9myylnPdoa39CrJYhzeTD4xL5P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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