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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee5dbbbf8626493343d86229f4d250e586c6834cb6dbb115c0796623d02db6a6' 
  AND token = 'Yls+rYwj2dcTDfChaCE+xsbOpeOO1dwWLUCKeAXHZF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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