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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3887dd9bcb424c34a8b33e6c9709843ba3b7e009e819cf25ba7c94b728c8b6d' 
  AND token = 'LUx/8PK+5YJCX9qvzvqIFZ8edEbDkZtd3CuPIs88qrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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